26 TREE WOUNDS AND DISEASES 



carried out in a satisfactory manner. The 

 pruning chisel, gouge, mallet, and saws of 

 several shapes and sizes are most useful in 

 cleaning out a hollow trunk ; but the exigencies 

 of each case will point out the most successful 

 means of dealing with difficulties and the tools 

 to be employed. 



Of late years, some good work has been 

 done by the London County Council towards 

 the preservation of old and remarkable trees 

 in their Metropolitan parks, and the accom- 

 panying illustration shows a giant and well- 

 known beech on Hampstead Heath that has 

 recently been strengthened and its span of life 

 greatly extended by careful removal of all 

 decayed wood and filling the cavity with 

 concrete. 



